[time-nuts] WWVB Measurements
EWKehren at aol.com
EWKehren at aol.com
Mon Mar 28 10:51:36 UTC 2011
Living in Miami probably as far away as possible in the continental US I
have no problem receiving WWVB. When I moved here in 1993, 60 KHz was my main
reference source. I used a Tracor 599 and a HP 117 along with a 4 foot
commercial loop. The 599 showed clearly superior performance. Later Austron
Loran C was added. The 117 was put on the shelf because without paper it was
not conducive for long term tracking.When $5 Million homes where build
directly next to me the loop had to go, plus the homes where in the direct pass
with the transmitting site. Homes here are built because of code with
concrete cinder blocks and vertical 1" rebar every one or two feet. I did
replace the loop with a commercial 60 KHz ferrite rod unit that also does an
excellent job. With the new location of the antenna I try to peak between the
two houses but there is also a power transformer on a pole within a 10
degree window. During the time I relied on 60 KHz the 599 worked flawless and
as soon as I have room in my lab again I will run it against a tbolt.
I am presently cleaning house in preparation for a next year move and it is
depressing to throw out stuff that at one time I paid good money for. No
room to move in the lab right now.
In the nineties Junghans came to Miami to do some field strength
measurements in preparation with their product roll out. Knowing their senior
management I had an opportunity to host them. I ended up with four Junghans MEGA
clocks and two MEGA watches. The watches have the antenna in the leather
watch bands (their patent). All work well in a house with steel rebar and two
houses next to me in the signal pass. The same is true of the receiver in
my La Crosse weather station I bought three years ago. The only way I can
really tell when we change daylight time and I make it a point to check the
following morning. With out exception they all change.
Bert Kehren
In a message dated 3/28/2011 12:11:15 A.M. Eastern Daylight Time,
hmurray at megapathdsl.net writes:
> Pretty much before all these switching power supplies and cpfls etc.
Does anybody know what frequency CPFLs are using today?
I remember that we had some (non-compact) ceiling fluorescents at work
with
"electronic" ballasts that were in the 50-60 KHz range. That was 5 years
ago.
I wonder if all that junk will eventually migrate to well above 60 KHz to
take advantage of the smaller magnetics and open up WWVB again.
--
These are my opinions, not necessarily my employer's. I hate spam.
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